There are a lot of useful posts about lighting here and in over in advocacy. The mods helpfully created a sticky, but I think a commuting sub-forum (like they have in the Road Cycling section for racing) would be more helpful. A single sticky doesn't facilitate people discussing specific products or problems.
And, of course, Total Geekiness would be the top sticky in the sub-forum.
I put this here instead of in user assistance because I wanted the people who use this forum to have a chance to see the idea, argue about it, or ignore it as they see fit.